Terrain Controlled Flow Rainwater Outlet System

Rainwater Interception Outlet for Commercial and Public Buildings

Designed to control rainwater run-off from roof areas and podium decks, the Rainwater Interception Outlet is a 2 part disc which can be installed inside any of our large rainwater outlets to control the flow of rainwater at source on the roof or podium deck, complementing our Rainwater Interception System for roofs and podiums.


The rainwater outlet has 8 positions, which allows a different flow rate on the head of water. The rainwater is attenuated at source within permavoid geocellular cells and released at the designed flow rate.


It should be used in conjunction with the trusted Terrain range of engineered PVC draiange pipes and fittings and Terrain FUZE HDPE drainage pipe products for in-buildings rainwater drainage for a full system approach.

  • PVC Soil and Waste Systems

    Terrain pioneered the development of solvent-weld pipe systems over 50 years ago and we are recognised worldwide for our premium product range and knowledge.

  • Terrain Rainwater Outlets

    We’ve an extensive range of rainwater outlets for flat roof and balcony applications for commercial, industrial and public sector developments.